KR200436745Y1 - Piping structure of fuel cell system for heating - Google Patents

Abstract

The present invention relates to a piping structure of a fuel cell system for heating, and a pipe connecting the heat exchanger 12 of the power generation module 10 including the fuel cell stack 11 and the hot water storage tank 21 of the hot water storage module 20. In the hot water storage tank 21 is a hot water pipe 32 in which hot water flows from the heat exchanger 12 to the hot water storage tank 21 inside the cold water pipe 31 through which cold water flows to the heat exchanger 12. It features.

Therefore, the heat loss is reduced by recovering the heat of hot water into the cold water instead of losing it to the air, thereby improving the system efficiency, and the insulation cost and the labor cost are reduced because only the cold water pipe 31 located outside is insulated. .

Description

Plumbing structure of fuel cell system for heating {a piping sturcture of heating fuel cell system}

1 is a piping structure diagram of a conventional fuel cell system for heating;

2 is a piping structure diagram of a fuel cell system for heating according to the present invention;

3 is a cross-sectional view taken along the line A-A of Figure 2, a cross-sectional view of the pipe according to the present invention,

4 is a cross-sectional view of portion B of FIG.

5 is a modified embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: power generation module 11: fuel cell stack

12 heat exchanger 13 cooling water circulation

20: hot water storage module 21: hot water storage tank

31: cold water pipe 32: hot water pipe

33: support member 40: heat insulating material

50 connector 51 housing

52: inner pipe 60: connecting nut

70: O-ring 80: fitting

90: hour

The present invention relates to a piping structure of a fuel cell system for heating, and more particularly, to a piping structure of a fuel cell system for heating that can reduce heat loss generated in a pipe and reduce a heat insulating cost of a pipe.

In general, a fuel cell is an environmentally friendly power generation system that generates electricity by electrochemical reaction between hydrogen in the reformed gas obtained by reforming fuels such as natural gas, methanol, gasoline, and oxygen in the air at two electrode plates between electrolyte membranes. Its high energy efficiency makes it widely used in various fields.

1 shows a heating fuel cell system for supplying hot water for heating a home.

The heating fuel cell system includes a power generation module 10 having a fuel cell stack 11 and a heat exchanger 12 for cooling thereof, and a hot water storage module 20 having a hot water storage tank 21.

Since the fuel cell stack 11 generates heat during power generation, the fuel cell stack 11 must be properly cooled to protect the device and maintain power generation performance. For this, the fuel cell stack 11 includes a cooling water circulation pipe 13.

On the other hand, the hot water storage tank 21 of the hot water storage module 20 is connected to the heat exchanger 12, the cold water pipe 31 and the hot water pipe (32).

That is, the cooling water circulation pipe 13 is a high temperature heat source of the heat exchanger 12, and a portion connecting the cold water pipe 31 and the hot water pipe 32 is a low temperature heat source of the heat exchanger 12.

Therefore, when cold water flows into the heat exchanger 12 from the hot water storage tank 21 through the cold water pipe 31, the cold water becomes hot water by exchanging heat with the stack cooling water of the cooling water circulation path 13. Flow through the hot water storage tank 21 is stored, and the stack cooling water is cooled by taking heat away from the cold water and being supplied into the fuel cell stack 11 to cool the fuel cell stack 11.

Therefore, as the above process is repeated, the fuel cell stack 11 is continuously cooled, and since hot water is stored at a predetermined temperature or higher in the hot water storage tank 21, the hot water can be supplied to a heating pipe to perform heating. (Description of sensors and valves for temperature control is omitted.)

However, in the conventional configuration as described above, since the cold water pipe 31 and the hot water pipe 32 connecting the hot water storage tank 21 and the heat exchanger 12 are spaced apart from each other and installed separately, the heat is heated in the heat exchanger 12. While the hot water flows through the hot water pipe 32, a large amount of heat loss occurs in the atmosphere. This deepens as the distance between the power generation module 10 and the hot water storage module 20 increases, causing the efficiency of the heating fuel cell system to be greatly reduced.

In addition, since the cold water pipe 31 and the hot water pipe 32 are separately installed as described above, the heat insulating material must be separately installed in both of the pipelines, resulting in an increase in cost and labor.

The present invention has been devised to solve the above problems, the heating fuel cell to minimize the heat loss through the connection pipe of the power generation module and hot water storage module, and to reduce the cost and workmanship due to the installation of the insulation material The purpose is to provide a piping structure for the system.

The present invention for achieving the above object,

A power generation module having a fuel cell stack and a heat exchanger, and a cooling water circulation pipe circulating the fuel cell stack and the heat exchanger, a hot water storage module having a hot water storage tank, and the heat exchanger and the hot water storage tank are connected to a cold water pipe and a hot water pipe. In the fuel cell system for heating,

The cold water pipe and the hot water pipe is characterized by consisting of a double pipe structure is inserted into the hot water pipe inside the cold water pipe.

Therefore, since the hot water pipe is not exposed to the atmosphere, the heat loss is reduced, and the cost and work man-hours are reduced because only the insulating material needs to be installed for the cold water pipe.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a piping structure diagram of a fuel cell system for heating according to the present invention, the basic configuration of the fuel cell system for heating is the same as the conventional.

That is, a fuel cell stack 11 for generating power while generating hydrogen and oxygen, a heat exchanger 12 for cooling the fuel cell stack 11, and a fuel cell stack 11 and a heat exchanger A hot water storage module 20 having a power generation module 10 having a cooling water circulation pipe 13 circulating 12 and a hot water storage tank 21 storing hot water generated by heating through the heat exchanger 12. The heat exchanger 12 of the power generation module 10 and the hot water storage tank 21 of the hot water storage module 20 are connected to the cold water pipe 31 and the hot water pipe 32.

In such a structure, the present invention is characterized in that the cold water pipe 31 and the hot water pipe 32 has a double pipe structure.

That is, as shown in FIGS. 2 and 3, the hot water pipe 32 is inserted into the cold water pipe 31. A support member 33 is formed at regular intervals in the circumferential direction between the cold water pipe 31 and the hot water pipe 32 to stably position the hot water pipe 32 in the center portion of the cold water pipe 31.

In addition, the support member 33 may be formed as a whole in the longitudinal direction of the cold / hot water pipes (31, 32), or may be formed of a suitable length at regular intervals.

On the other hand, the cold water pipe 31 is connected to the lower portion of the hot water storage tank 21, the hot water pipe 32 protrudes into the inside of the hot water storage tank 21 through the end of the cold water pipe 31, upwards Being extended to be installed so that the hot water discharging end is located on the upper portion of the hot water storage tank (21).

This is to use the convection phenomenon in the hot water storage tank 21, the hot water discharged from the hot water pipe 32 is located at the top and gradually decreases the temperature is lowered down again through the cold water pipe (31) through the heat exchanger (12) This is to allow the heat to flow to the side.

4 shows a cross section of a connector 50 used to connect the cold water pipe 31 and the hot water pipe 32 to the heat exchanger 12.

The connector 50 has a housing 51 which is a cylindrical component having the same diameter as that of the cold water pipe 31, and an inner pipe having the same diameter as the hot water pipe 32 and installed through the center of the housing 51. 52, wherein the upper end (on the outer circumferential surface) of the housing 51 has a discharge port 51a having a screw formed on the outer circumferential surface of the housing 51 so as to be connected to the inlet of the heat exchanger 12, and the housing 51 At the center of the end side of the inlet), an inlet 51b formed in the same shape as the outlet 51a is formed in the axial direction of the housing 51 so as to be connected to the outlet of the heat exchanger 12.

The inner pipe 52 is installed to penetrate the inlet 51b of the housing 51. That is, in the installation completed state, the outer end of the housing 51 of the inner pipe 52 is inserted into the outlet of the heat exchanger 12.

Meanwhile, the cold water pipe 31 and the hot water pipe 32 are connected to the connector 50 while the connector 50 is mounted on the heat exchanger 12 in the above state.

First, the hot water pipe 32 is opposed to the inner pipe 52 is connected via the connection nut 60. To this end, screws are formed at corresponding ends of the hot water pipe 32 and the inner pipe 52, respectively. Of course, the sealing tape used for the common pipe joint is wound around the threaded portion of the hot water pipe 32 and the inner pipe 52. (The sealing tape is not shown.)

Thereafter, the cold water pipe 31 is connected to the housing 51, and flanges 51c and 31a are formed at the ends of the housing 51 and the cold water pipe 31 so as to be connected to each other, thereby making a connection. O-rings 70 are provided between the flanges 51c and 31a to prevent leakage.

The flanges 51c and 31a are fastened to each other via a U-shaped cross-fitting fitting 80, which is fitted to their outer circumference, and bolts < RTI ID = 0.0 > < / RTI > Of course, a variety of fastening means such as nuts can be used.

Thereafter, as shown in Figure 3, the heat insulating material 40 is constructed on the outside of the cold water pipe (32).

The working effect of the present invention will now be described.

According to the piping structure of the present invention as shown in Figure 2, since the hot water pipe 32 is installed in the cold water pipe 31 is not exposed to the atmosphere as conventional.

Therefore, heat loss does not occur from the hot water flowing through the hot water pipe 32 into the atmosphere. Instead, the hot water pipe 32 is heat-exchanged with the cold water in the cold water pipe 31. Since the cold water is also part of the fuel cell system, the heat of the hot water is discharged into the atmosphere and is not lost and is recovered into the system.

That is, in the past, the heat of hot water is completely discharged to the outside of the system to reduce the efficiency of the system, but according to the present invention, since the heat of the hot water is absorbed into the cold water and recovered to the system, the heat loss is greatly reduced in view of the overall system. System efficiency is improved.

On the other hand, the present invention as described above, since the hot water pipe 32 is inside the cold water pipe 31, there is no need to install a heat insulating material in the hot water pipe 32, as shown in Figure 3 only the outside of the cold water pipe 31 ( 40).

Therefore, the material cost due to the installation of the heat insulator 40 is reduced, and also the work maneuver is reduced, there is an effect that the overall work is easy and the cost is reduced.

On the other hand, the embodiment shown in Figure 2 is a system for increasing the water temperature in the hot water storage tank 21 by repeatedly circulating the storage water of the hot water storage tank 21 to the heat exchanger 12, the water supply from the system overall point of view It is made of a hot water storage tank 21. (water supply means not shown)

However, in some cases, the hot water storage tank 21 may be configured so that only hot water is supplied to the heating pipe and water is supplied from the outside to the system through the cold water pipe 31.

This example is shown in FIG. 5, in the illustrated embodiment, a city water 90, that is, a water conduit is connected to the cold water pipe 31.

Therefore, the time water 90 is directly supplied to the system, heated in the heat exchanger 12, made of hot water, stored in the hot water storage tank 21, and can be supplied to the heating pipe.

As described above, according to the present invention, the amount of heat lost from the hot water pipe to the air can be recovered from the cold water pipe, thereby reducing the heat loss of the entire system and improving the system efficiency.

In addition, since only the cold water pipes located on the outside of the cold / hot water pipes should be insulated, the material cost is reduced by reducing the use of insulation, and the labor and time costs are reduced by reducing the number of labor.

Claims (6)

A power generation module (10) having a fuel cell stack (11), a heat exchanger (12), and a coolant circulation pipe (13) for circulating the fuel cell stack (11) and a heat exchanger (12), and a hot water storage tank (21). In the equipped hot water storage module 20, and the heat exchanger 12 and the hot water storage tank 21 is connected to the cold water pipe 31 and the hot water pipe 32 in the heating fuel cell system, The cold water pipe 31 and the hot water pipe 32 has a double pipe structure in which a hot water pipe 32 is inserted into the cold water pipe 31; The cold water pipe (31) and the hot water pipe (32) are connected to a heat exchanger (12) via a connector (50); The connector 50 has a flange 51c formed at one end thereof, and is mutually coupled to the flange 31c of the cold water pipe 31, and a screw is formed at an outer circumferential surface at the center of the top and side surfaces of the other end, respectively. A housing 51 formed with an outlet 51a and an inlet 51b which are piped to the inlet and the outlet of the; An inner pipe 52 installed to penetrate the inlet 51b and having one end connected to the hot water pipe 32 and the connection nut 60 through the inlet pipe 51b; Piping structure of the fuel cell system for heating, characterized in that consisting of. The fuel cell system for heating according to claim 1, wherein a support member (33) is formed between the cold water pipe (31) and the hot water pipe (32) to support the hot water pipe (32) at regular intervals in the circumferential direction. Piping structure. The piping structure of a fuel cell system for heating according to claim 1, wherein a heat insulating material (40) is provided only outside the cold water pipe (31). delete The piping structure of a fuel cell system for heating according to claim 1, wherein an O-ring (70) is provided between the housing (51) and the flanges (51c, 31a) of the cold water pipe (31). The piping structure of a fuel cell system for heating according to claim 1, wherein the cold water pipe (31) is connected to the municipal water (90).

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